Reaktion #250

Reaktionsgleichung

Clc1ccnc(Cl)c1

Cn1nccc1N

→

Cn1nccc1Nc1cc(Cl)ccn

Ausbeute 60.5%

Lösungsmittel

C1COCCO1

Reaktionsbedingungen

Vorschrift

TRIS(DIBENZYLIDENEACETONE)DIPALLADIUM(0) (50.1 mg, 0.05 mmol) was added in one portion to 2,4-dichloropyridine (200 mg, 1.35 mmol), 1-methyl-1H-pyrazol-5-amine (144 mg, 1.49 mmol), cesium carbonate (660 mg, 2.03 mmol) and (9,9-dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphine) (93 mg, 0.16 mmol) in 1,4-dioxane (20 mL) warmed to 105°C over a period of 24 hours under nitrogen. The reaction mixture was evaporated to dryness and redissolved in DCM (20 mL), and washed with water (25 mL). The organic layer filtered using phase separating paper and evaporated to afford crude product. The crude product was purified by flash silica chromatography, elution gradient 0 to 3% MeOH in DCM. Pure fractions were evaporated to dryness to afford 4-chloro-N-(1-methyl-1H-pyrazol-5-yl)pyridin-2-amine (171 mg, 60.5 %) as a yellow crystalline solid.

Quelle